NSCFArray objectForKey 崩溃？

Question

我正在尝试做一些相对简单的事情。我的包中有一个 .plist，我试图将其加密保存到文档目录中。现在，在我尝试添加加密之前，它工作得很好。然而，新的崩溃发生了。

这就是我保存 .plist 的方式：

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"Hi.plist"];
    NSFileManager *fileManager = [NSFileManager defaultManager];

    if (![fileManager fileExistsAtPath: path]) {
    NSString *bundle = [[NSBundle mainBundle] pathForResource:@"GameSave" ofType:@"plist"];
    NSData *plistData = [NSData dataWithContentsOfFile:bundle];
    [NSKeyedArchiver archiveRootObject:plistData toFile:path];
    plistData = [plistData AES256EncryptWithKey:@"536335"];
    [plistData writeToFile:path atomically:YES];
}

然后这就是我检索 .plist 的方式（然后更改值并重新保存）

        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *path = [documentsDirectory stringByAppendingPathComponent:@"Hi.plist"];

        //Get array and then current level dict
        NSData *plistData = [[NSData alloc] initWithContentsOfFile:path];
        plistData = [plistData AES256DecryptWithKey:@"1111"];

        NSMutableArray *savegameArray = [[NSKeyedUnarchiver unarchiveObjectWithData:plistData] mutableCopy];
        int objectIndex = [Singleton sharedInstance].levelNumber - 1;
        NSMutableDictionary *levelDict = [[savegameArray objectAtIndex:objectIndex] mutableCopy];
        [levelDict setObject:videoID forKey:@"RecordingURL"];
        //Now put new dict back in array
        [savegameArray replaceObjectAtIndex:objectIndex withObject:levelDict];

        NSData *savedarrayData = [NSKeyedArchiver archivedDataWithRootObject:savegameArray];
        savedarrayData = [savedarrayData AES256EncryptWithKey:@"1111"];
        [savedarrayData writeToFile:path atomically:YES];

但是，在每次我到达这一行时读取代码： NSMutableArray *savegameArray = [[NSKeyedUnarchiver unarchiveObjectWithData:plistData] mutableCopy]; 有一个 SIGABRT 崩溃，打印：

'-[__NSCFArray objectForKey:]:未识别的选择器发送到实例0x16604140'

我究竟做错了什么？

Answer 1

正如我们通过聊天发现的，我们必须首先转换解密的 NSData 反对适当的 NSPropertyListSerialization 序列化。

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"Hi.plist"];

NSData *plistData = [[NSData alloc] initWithContentsOfFile:path];
NSData *newData = [plistData AES256DecryptWithKey:@"1111"];

NSPropertyListFormat format;

NSMutableArray *savegameArray = [[NSPropertyListSerialization propertyListFromData:newData mutabilityOption:NSPropertyListMutableContainersAndLeaves format:&format errorDescription:nil]mutableCopy];

NSLog(@"Array: %@",savegameArray);

Answer 2

您只需要将内存分配给您的nsmutablearray ... nsmutablearray * arrayname= [[nsmutablearray alloc] init]; 直到你这样做，崩溃会出现..

希望这有用。

谢谢， Rajesh ..